CODEWITHSUNDEEP
iosuicollectionviewuicollectionviewcell
AnthonyR
AnthonyR

Reputation: 3545

Inserting a new cell into a collectionview

I try to add a new cell in my UIcollectionView but it doesn't work. In fact I send a post request to my API, I wait for the response, when I get the response, I put de JSON content into an NSDictionnary.

My CellForItemAtIndexPath Datasource method loads cell content from an array called "formationsData", so when I get the response, I add my NSDictionnary into this array.

In numberOfItemAtIndexPath I return something like : [self.formationData count].

Here is my code when I post my request : 

 NSDictionary * response = [responseJSON valueForKey:@"formation"];
    [(NSMutableArray *)_formationsView.carousel.formationsData addObject:response]; 
    [_formationsView.carousel insertItemsAtIndexPaths:@[[NSIndexPath indexPathForItem: _lastRowIndex-1 inSection:0]]]; //insert at index : last row - 1
//[_formationsView.carousel reloadData]

Before I was using reloadData but my app crash when I do that.

My problem : enter image description here

Upvotes: 0

Views: 67

Answers (1)

Caleb
Caleb

Reputation: 124997

Before I was using reloadData but my app crash when I do that.

Then that's the problem you need to solve. Just adding an item to the array you use to populate the collection view isn't enough to make a cell appear. The collection view doesn't have any idea where the data source gets its data; when there's a change to the data, you need to call -reloadData or similar.

If -reloadData causes a crash, then you need to figure out why and fix it.

Upvotes: 1

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